This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...vided no organized protection against force, it would compel every citizen to go about armed, to turn his home into a fortress, to shoot any strangers approaching his door — or to join a prote ctive gang of citizens who would fight other gangs, formed for the same purpose, and thus bring about the degeneration of that society into the chaos of gang-rule, i.e., rule by brute force, int o perpetual tribal warfare of prehistorical savages.

The use of physical force — even its retaliatory use — cannot be left at the discretion of individual citizens. Peaceful co...
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